Author Topic: Custom Fuzz Face not working  (Read 139 times)

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Owen Page

Custom Fuzz Face not working
« on: January 11, 2017, 08:29:52 AM »
Hi,

I've been designing and building a FuzzFace using BC183Ls as a school project and am trying to breadboard my design. I've just plugged it into my amp with my strat hooked up to it and all I'm getting is a small amount of white noise.

  • VR3 is used to adjust the output of the pedal.
  • The 5000K and zener diode are not used on the breadboard.

This is my breadboard layout (A4 printable: https://dl.dropboxusercontent.com/u/89086472/Breadboard.png)


When I ground R2, R3, R4 and the emitters of the BC183Ls it makes a loud crackling noise which I assume is earth noise and the 500K pot works, but the rest of the circuit seems to be doing nothing.
Could anyone point out anything that may be wrong with it?

Owen
« Last Edit: January 11, 2017, 08:34:06 AM by Owen Page »

duck_arse

Re: Custom Fuzz Face not working
« Reply #1 on: January 12, 2017, 04:58:51 AM »
hello Owen and welcome to the forum. that's a hell of a wiring diagram you have there, very bright, somewhat hard to read. but never mind that.

please check your transistor pinout VERY CAREFULLY against the datasheet. the L suffix indicates an 'end base' rather than a 'centre base' pinout, and a straight-line pinout, rather than a cranked centre pin pinout.

then come back and tell us what you've found.
what if what it is isn't what it is?
>>south-hemi handbenders<<

Owen Page

Re: Custom Fuzz Face not working
« Reply #2 on: January 12, 2017, 09:52:19 AM »
Thanks for the reply,

Sorry about the bright colours, I made it so I could easily tell the difference between tracks while building the breadboard.

Have just looked at the datasheet (http://pdf.datasheetcatalog.com/datasheet/MicroElectronics/mXuvyzv.pdf) and the base and collector are the other way round to how I had previously anticipated! I'll rejig the diagram to account for this and see if it works.  ;D

[UPDATE]
Nope, swapped the connections for the base and collector over and flipped the transistors but I still get a crackling noise but no earth noise.
Updated sheet: https://dl.dropboxusercontent.com/u/89086472/Breadboard.png
Datasheet: http://pdf.datasheetcatalog.com/datasheet/MicroElectronics/mXuvyzv.pdf
« Last Edit: January 12, 2017, 10:55:44 AM by Owen Page »

duck_arse

Re: Custom Fuzz Face not working
« Reply #3 on: January 13, 2017, 03:42:01 AM »
owen, we now point you to the "what to do when it doesn't work" thread, somewheres hereabouts. go, follow, answer, return.

if I may, I'd advise you also look for the thread (and download the program) for diy layout creator, by bancika, a member here. it is pretty much our unofficial standard for layout diagrams, and has provision for breadboard layouts. and all the colours you can think of. (my layouts tend to look like tetris games, so they tell me.)
what if what it is isn't what it is?
>>south-hemi handbenders<<

Ruptor

Re: Custom Fuzz Face not working
« Reply #4 on: January 13, 2017, 03:59:10 AM »
Hi Owen
    Just a couple of small points. Did you test the transistors before reversing them so you know they haven't blown up? The polarised input capacitor would normally be connected with the positive to the input and C3 should be the same but it probably isn't a polarised type in this case.

Gus

Re: Custom Fuzz Face not working
« Reply #5 on: January 13, 2017, 02:16:46 PM »
Check your breadboard. Check the left side vertical runs(red and green) you are using. Check for continuity from end to end. IIRC some breadboards have breaks in the two pairs of side conductors. If there is a break(s) in the green and red you will have a problem.
Also as posted in this tread read "what to do when it doesn't work" thread